Basics of C language

Structure of C programming

• Document section
• Link section
• Definition section 
• Global variable section

main()

{

     Declaration section

     Execution section

}

user defined  functions

Function 1

Function 2 

Function 3

                 .
                 .
Function n

• Document section :-

This section is optional part and this part is not executed by the computer/software. It is just ignored.

If this part is in single line we can mention it by double slash ( // ). double slash should be before the starting of the line and after the end of line.

e.g. // This is an example //

If this part is in multiple lines we can mention it by slash star ( /* )and  star slash ( */ ). slash star and  star slash should be before the starting of the line and after the end of line respectively.

e.g. /* This an example of documentation section. Everything is ignored by the compiler or computer written in this section. Follow my blog for latest updates. */

• Link section :-

This section is compulsory in the programming.

Header files :-

There are number of header files some of them are 

• stdio.h
• conio.h
• string.h
• math.h
• graphics.h

Syntax 

#include<headerfile>

e.g   

#include<stdio.h>

#include<conio.h>

#include<math.h>

# - preprocessor directive